It is all my fault

It is all my fault Sorry!it is all my fault.Could you forgive me? This is all my fault but i 'll belive it all the time I think this is all my fault Is all my fault中文翻译是? It's my fault, This is my fault.与 It is my fault.有什么区别.this is 与 it is 分别在什 all my faults还是all my fault This is not your fault it was my fault, I for give you 什么意思 it was my fault和 it is my fault有什么区别,还是说只有一种是正确的. i quarreled with my deskmate yesterday,it's all my fault. Everything is all my fault.为什么此句要加all,everything不是单数吗?是口语化的?